The "green cap" is an Oriental metalized plastic film type which is similar to a European one that is boxed. Its value is marked "103" which is 10,000pF, 0.01uf or 10nF. Its tolerance is marked with a letter where J is 5%, K is 10% and M is 20%.
The same value for a European metalized plastic film capacitor would be marked "10n" then the same letter for the tolerance.
Since it is just a capacitor that feeds a resistor then the filter slope is a very gradual 6dB/octave.
EDIT: A metalized plastic film capacitor is not polarized.
Here is a photo of some European metalized plastic film capacitors: